With the SIM card-based service mapAmobile users are able to locate other mobile users, via SMS or the web. Users can also enable special SMS notifications when a mobile phone move to a particular location.

The services is available in UK, for mobiles on O2, Vodafone, Orange or T-Mobile networks, with a registration fee of £29.99. A fee of 0.30 is charged each time the service is debited from a balance account. More credits can be added online with credit card or by purchasing a £10 credit top up voucher from selected stores.

Once registered with the service, users can log onto their accounts using a web browser. By clicking 'Where is this mobile?' the service will request the location of a mobile phone.

After a short while, you will receive a reply online giving the location of the mobile phone: e.g. 'Gemma is in the vicinity of Carnaby Street, London W1' together with the date, time and accuracy of the location. You will also have the option to see a map showing street names and points of interest.

This is approximate only, since current mobile phones do not have positioning devices (liek GPS), and the service relies on current cell location.